std:: swap (std::unordered_multimap)
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定义于头文件
<unordered_map>
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template
<
class
Key,
class
T,
class
Hash,
class
KeyEqual,
class
Alloc
>
void
swap
(
std::
unordered_multimap
<
Key, T, Hash, KeyEqual, Alloc
>
&
lhs,
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(C++11 起)
(C++17 前) |
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template
<
class
Key,
class
T,
class
Hash,
class
KeyEqual,
class
Alloc
>
void
swap
(
std::
unordered_multimap
<
Key, T, Hash, KeyEqual, Alloc
>
&
lhs,
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(C++17 起)
(C++26 起为 constexpr) |
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为 std::swap 算法针对 std::unordered_multimap 进行特化。交换 lhs 与 rhs 的内容。实际调用 lhs. swap ( rhs ) 。
目录参数
复杂度常量。 异常处理
示例运行此代码 #include <algorithm>
#include <iostream>
#include <unordered_map>
int main()
{
std::unordered_multimap<int, char> alice{{1, 'a'}, {2, 'b'}, {3, 'c'}};
std::unordered_multimap<int, char> bob{{7, 'Z'}, {8, 'Y'}, {9, 'X'}, {10, 'W'}};
auto print = [](const std::pair<int, char>& n)
{
std::cout << ' ' << n.first << ':' << n.second;
};
// Print state before swap
std::cout << "Alice:";
std::for_each(alice.begin(), alice.end(), print);
std::cout << "\nBobby:";
std::for_each(bob.begin(), bob.end(), print);
std::cout << '\n';
std::cout << "-- SWAP\n";
std::swap(alice, bob);
// Print state after swap
std::cout << "Alice:";
std::for_each(alice.begin(), alice.end(), print);
std::cout << "\nBobby:";
std::for_each(bob.begin(), bob.end(), print);
std::cout << '\n';
}
可能的输出： Alice: 1:a 2:b 3:c
Bobby: 7:Z 8:Y 9:X 10:W
-- SWAP
Alice: 7:Z 8:Y 9:X 10:W
Bobby: 1:a 2:b 3:c
参见
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